From: Mayuresh Kulkarni <mkulkarni@nvidia.com>
Date: Fri, 14 Jan 2011 02:22:43 +0000 (-0800)
Subject: video: tegra: host: disable MPE auto-power-gate
X-Git-Tag: firefly_0821_release~9833^2~58^2~3
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=cea5c11234ecf4692aae8cf27a4d0c8008c703a0;p=firefly-linux-kernel-4.4.55.git

video: tegra: host: disable MPE auto-power-gate

It is seen that auto-power-gate of MPE causes some issues when long run
camera stress test is run. The issue manifest itself in the form of
MPE sync-point not getting triggered from hardware and hence the caller
who is waiting on it hangs up the system.

Disabling auto-power-gate for MPE seems to resolve this issue.

Original work of Jay Cheng <jacheng@nvidia.com>
Signed-off-by: Mayuresh Kulkarni <mkulkarni@nvidia.com>

Change-Id: Iaef9f959cbc00dd715352ca637955cd2bea6f355
---

diff --git a/drivers/video/tegra/host/nvhost_acm.c b/drivers/video/tegra/host/nvhost_acm.c
index a4bbce2b6f1d..14b2b5a6b8c1 100644
--- a/drivers/video/tegra/host/nvhost_acm.c
+++ b/drivers/video/tegra/host/nvhost_acm.c
@@ -31,6 +31,7 @@
 #define ACM_TIMEOUT 1*HZ
 
 #define DISABLE_3D_POWERGATING
+#define DISABLE_MPE_POWERGATING
 
 void nvhost_module_busy(struct nvhost_module *mod)
 {
@@ -156,6 +157,19 @@ int nvhost_module_init(struct nvhost_module *mod, const char *name,
 	}
 #endif
 
+#ifdef DISABLE_MPE_POWERGATING
+	/*
+	 * Disable power gating for MPE as it seems to cause issues with
+	 * camera record stress tests when run in loop.
+	 */
+	if (mod->powergate_id == TEGRA_POWERGATE_MPE) {
+		tegra_powergate_sequence_power_up(mod->powergate_id,
+			mod->clk[0]);
+		clk_disable(mod->clk[0]);
+		mod->powergate_id = -1;
+	}
+#endif
+
 	mutex_init(&mod->lock);
 	init_waitqueue_head(&mod->idle);
 	INIT_DELAYED_WORK(&mod->powerdown, powerdown_handler);